End cover assembly, energy storage device and electric equipment

Abstract

The utility model discloses an end cap assembly, energy storage device and electric equipment, the end cap assembly comprises an end cap plate, a lower plastic, a pole and a compression ring, the end cap plate is provided with a first through hole penetrating along a first direction, the lower plastic and the end cap plate are laminated, the lower plastic is provided with a second through hole penetrating along the first direction, and the compression ring is arranged on the second through hole. The surface, facing the end cover plate, of the lower plastic is provided with a containing groove, the second through hole penetrates through the bottom face of the containing groove, the pole sequentially penetrates through the first through hole and the second through hole, the pressing ring is arranged on the periphery of the pole in a sleeving mode and located in the containing groove, one of the side wall of the containing groove and the peripheral face of the pressing ring is provided with a first groove, and the other one of the side wall of the containing groove and the peripheral face of the pressing ring is provided with a second groove. A first protrusion is arranged on one of the outer circumferential face of the pressing ring and the outer circumferential face of the pressing ring, and the first protrusion is embedded in the first groove.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device and electrical equipment. Background Art

[0002] As one of the important components of the battery, the end cap assembly is usually assembled from a cover plate, a pole, a lower plastic and other parts. During assembly, the pole is usually passed through the through holes of the cover plate and the lower plastic in turn, and then a pressure ring is sleeved on the outer circumference of the pole so that the pole can be pressed by the pressure ring to prevent the pole from shaking, thereby facilitating the subsequent welding of the pole and the adapter. Finally, the pole ear is welded and fixed to the adapter, thereby forming a circuit connection of the battery.

[0003] However, the contact area between the pressure ring and the lower plastic in the related art is relatively small, resulting in a relatively low torsional resistance of the pole, which makes the pole easy to loosen when subjected to torque, thereby affecting the safety and reliability of the battery. Utility Model Content

[0004] The embodiment of the utility model discloses an end cover assembly, an energy storage device and an electrical device, which can improve the torsion resistance of the pole, thereby improving the use safety and reliability of the energy storage device.

[0005] In order to achieve the above objectives, in a first aspect, the utility model discloses an end cover assembly, the end cover assembly comprising:

[0006] An end cover plate, wherein the end cover plate is provided with a first through hole penetrating along a first direction;

[0007] A lower plastic, wherein the lower plastic is stacked with the end cover plate, the lower plastic is provided with a second through hole penetrating along the first direction, and a receiving groove is provided on the surface of the lower plastic facing the end cover plate, and the second through hole penetrates the bottom surface of the receiving groove;

[0008] A pole, wherein the pole is sequentially inserted into the first through hole and the second through hole; and

[0009] A pressure ring, which is sleeved on the outer circumference of the pole and located in the accommodating groove;

[0010] Wherein, one of the side wall of the accommodating groove and the outer peripheral surface of the pressing ring is provided with a first groove, and the other of the side wall of the accommodating groove and the outer peripheral surface of the pressing ring is provided with a first protrusion, and the first protrusion is embedded in the first groove.

[0011] In the end cover assembly provided in the embodiment of the present application, the side wall of the accommodating groove on the lower plastic is provided with a first groove or a first protrusion, and the outer peripheral surface of the pressure ring is provided with a first protrusion or a first groove, wherein the first protrusion is embedded in the first groove, so that the cooperation between the first protrusion and the first groove can be utilized to prevent the pole from twisting, increase the contact area between the pressure ring and the lower plastic, thereby improving the torsional resistance of the pole, so that the pole can have a better torsional resistance effect when subjected to torque, so as to avoid loosening and shaking of the pole, thereby improving the safety and reliability of the energy storage device.

[0012] As an optional embodiment, in the embodiment of the first aspect of the utility model, the receiving groove is a polygonal groove, the pressure ring is a polygonal ring, one of the first groove or the first protrusion is located at the corner of the receiving groove, and the other of the first groove or the first protrusion is located at the corner of the pressure ring. The receiving groove is a polygonal groove, and the pressure ring is a polygonal ring. Compared with the receiving groove being a circular groove and the pressure ring being a circular ring, the pressure ring can be prevented from twisting, so that when the pole is subjected to torsion, the pole can have a better torsion resistance effect, thereby improving the safety and reliability of the energy storage device.

[0013] Although a polygonal accommodating groove and a polygonal pressure ring are used to limit the twisting of the pressure ring to prevent the pole from twisting, generally speaking, the positions where the two components are prone to torque and easy to fall off are usually at the corners. If there is a starting point for falling off, it should usually be at the corners. Therefore, the present application provides a first protrusion at the corners where the pressure ring is subjected to greater torque to cooperate with the first groove at the corners of the accommodating groove, so as to better prevent the risk of the pressure ring and the lower plastic from falling off after being subjected to torque, thereby ensuring the tightening effect of the pressure ring on the pole and preventing the pole from twisting.

[0014] As an optional embodiment, a second groove is provided on the surface of the end cover plate facing the lower plastic, and a second protrusion is convexly provided on the surface of the lower plastic facing the end cover plate, and the second protrusion is embedded in the second groove; in this way, when the lower plastic and the end cover plate are assembled, the second groove and the second protrusion can be used to fit the lower plastic in the circumferential and axial directions, and the assembly between the end cover plate and the lower plastic can be quickly positioned, thereby facilitating the assembly efficiency of the end cover assembly; at the same time, the first through hole and the second through hole can be correspondingly arranged, so that the pole can be sequentially penetrated through the second through hole and the first through hole, thereby facilitating the assembly of the end cover assembly;

[0015] The second protrusion is arranged corresponding to the receiving groove, and the second protrusion is provided with the first through hole, the receiving groove includes a first groove body and a second groove body part connected with the first groove body part, the first groove body part is formed on the lower plastic, and the second groove body part is formed on the second protrusion. By protruding a second protrusion corresponding to the receiving groove on the surface of the lower plastic facing away from the end cover plate, so that the second protrusion can provide a forming position for the receiving groove, so that part of the receiving groove can be formed on the second protrusion, that is, the receiving groove can extend from the lower plastic to the second protrusion, so that the depth of the receiving groove can be deepened without thickening the entire lower plastic, so as to ensure that the receiving groove has enough depth to accommodate a thicker pressure ring, so that the contact area between the outer peripheral surface of the pressure ring and the side wall of the receiving groove can be increased, thereby further increasing the contact area between the pressure ring and the lower plastic, thereby further improving the torsion resistance of the pole, and further improving the use safety and reliability of the energy storage device.

[0016] In addition, as can be seen from the above, through the provision of the second protrusion, the present application does not need to thicken the entire lower plastic, but can only thicken it partially to achieve a deepening of the depth of the first groove, which can make the weight of the lower plastic lighter, thereby facilitating a lightweight design of the end cover assembly.

[0017] As an optional implementation, in an embodiment of the first aspect of the utility model, the side wall of the second groove is provided with a first limiting surface, and the outer peripheral surface of the second protrusion is provided with a second limiting surface, and the second limiting surface and the first limiting surface are fitted together to limit the torsion between the lower plastic and the end cover plate, thereby limiting the rotational freedom of the lower plastic, thereby avoiding the phenomenon of rotation of the lower plastic relative to the pole, and further improving the structural stability of the end cover assembly; at the same time, the second limiting surface and the first limiting surface are fitted together, and the lower plastic and the end cover plate can only be installed in a specific direction, which has an anti-fool effect on the installation between the lower plastic and the end cover plate and avoids reverse installation.

[0018] As an optional implementation, in the embodiment of the first aspect of the utility model, a third limiting surface is provided at the position of the receiving groove corresponding to the second limiting surface, and the third limiting surface is arranged in parallel with the second limiting surface; a fourth limiting surface is also provided on the outer peripheral surface of the pressure ring, and the fourth limiting surface and the third limiting surface fit each other. In this way, on the one hand, the rotational freedom of the pressure ring can be further limited by the cooperation of the fourth limiting surface and the third limiting surface fitting each other, so as to better prevent the pole from twisting and improve the torsion resistance of the pole; on the other hand, by providing a third limiting surface parallel to the second limiting surface at the position of the receiving groove corresponding to the second limiting surface, it can ensure that the thickness of the lower plastic at any position can be kept uniform, so as to avoid the deformation of the lower plastic due to uneven thickness in the flow channel during the injection molding process, thereby facilitating the molding of the lower plastic.

[0019] As an optional implementation, in the embodiment of the first aspect of the utility model, there are multiple first grooves, and the multiple first grooves are arranged along the circumference of the receiving groove or along the circumference of the pressure ring; there are multiple first protrusions, and the multiple first protrusions are arranged along the circumference of the pressure ring or along the circumference of the receiving groove, and the multiple first protrusions are respectively embedded in the multiple first grooves. Providing multiple first grooves and multiple first protrusions can further improve the torsion resistance of the pole, thereby further improving the safety and reliability of the energy storage device.

[0020] As an optional embodiment, in an embodiment of the first aspect of the utility model, the end cover assembly also includes an upper plastic, which is stacked on a side of the end cover plate facing away from the lower plastic, and the lower plastic is provided with a third through hole extending along the first direction, and the pole is sequentially penetrated through the third through hole, the first through hole and the second through hole; wherein, one of the end cover plate and the upper plastic is provided with a third groove, and the other of the end cover plate and the upper plastic is provided with a third protrusion, and the third protrusion is embedded in the third groove, and / or, one of the upper plastic and the pole is provided with a fourth groove, and the other of the upper plastic and the pole is provided with a fourth protrusion, and the fourth protrusion is embedded in the fourth groove.

[0021] In this way, the upper plastic can be constrained with the pole and the end cover plate, and the rotational freedom of the pole can be constrained multiple times, so as to better prevent the pole from twisting, so that the pole can have a better anti-twist effect when subjected to torsion. Specifically, through the arrangement of the third groove, the third protrusion, the fourth groove and the fourth protrusion, the rotational freedom of the upper plastic can be limited by the matching constraint between the third protrusion and the third groove to limit the twisting between the upper plastic and the end cover plate; and the rotational freedom of the pole can be limited by the matching constraint between the fourth protrusion and the fourth groove to limit the twisting between the upper plastic and the pole. In this way, the anti-twist ability of the pole can be greatly improved, and the reliability of the end cover assembly can be enhanced.

[0022] As an optional implementation, in the embodiment of the first aspect of the utility model, when the upper plastic is provided with the third protrusion and the fourth groove, the third protrusion corresponds to the fourth groove; or, when the upper plastic is provided with the third groove and the fourth protrusion, the third groove corresponds to the fourth protrusion. In this way, the thickness of the upper plastic at any position can be kept uniform, so as to avoid deformation of the upper plastic due to uneven thickness in the flow channel during the injection molding process, thereby facilitating the molding of the upper plastic.

[0023] As an optional embodiment, in the embodiment of the first aspect of the utility model, the third groove includes two first straight groove walls and a first arc-shaped groove wall connected between the two first straight groove walls, the straight direction of the first straight groove wall has a first angle with the axial direction perpendicular to the first arc-shaped groove wall, the circumferential side surface of the third protrusion includes two first straight side surfaces and a first arc-shaped side surface connected between the two first straight side surfaces, the first straight side surface is fitted with the first straight groove wall, and the first arc-shaped side surface is fitted with the first arc-shaped groove wall; the fourth groove includes two second straight groove walls and a second arc-shaped groove wall connected between the two second straight groove walls, the straight direction of the second straight groove wall has a third angle with the axial direction perpendicular to the second arc-shaped groove wall, the circumferential side surface of the fourth protrusion includes two second straight side surfaces and a second arc-shaped side surface connected between the two second straight side surfaces, the second straight side surface is fitted with the first straight groove wall, and the second arc-shaped side surface is fitted with the second arc-shaped groove wall.

[0024] In this way, the shapes of the third groove, the third protrusion, the fourth groove and the fourth protrusion can all be fan-shaped. Since the third groove and the third protrusion are in surface contact, as well as the fourth groove and the fourth protrusion are in surface contact, the fan-shaped third groove, the third protrusion, the fourth groove and the fourth protrusion are more helpful to increase the contact area between the third groove and the third protrusion, and the contact area between the fourth groove and the fourth protrusion, compared with the third groove, the third protrusion, the fourth groove and the fourth protrusion being square in shape, so as to avoid uneven force.

[0025] As an optional embodiment, in the embodiment of the first aspect of the utility model, the surface of the upper plastic facing away from the end cover plate is provided with a receiving groove, and the third through hole penetrates the bottom surface of the receiving groove; the pole comprises a column part and a disk part, the column part is sequentially penetrated through the third through hole, the first through hole and the second through hole, the pressure ring is sleeved on the outer periphery of the column part, the disk part is connected to the column part, and the disk part is at least partially located in the receiving groove; wherein, the bottom surface of the receiving groove and one of the disk part are provided with the fourth groove, and the bottom surface of the receiving groove and the other of the disk part are provided with a fourth protrusion. By providing a receiving groove on the surface of the upper plastic facing away from the end cover plate to accommodate part or the entire disk part, the overall structure of the end cover assembly can be made more compact, which is conducive to the miniaturization design of the end cover assembly.

[0026] In a second aspect, the utility model discloses an energy storage device, which includes a shell, an electrode assembly and an end cover assembly as described in the first aspect above, wherein the shell has an opening, the electrode assembly is built into the shell, the end cover plate is sealed and connected to the opening, the lower plastic is arranged toward the electrode assembly, and the pole is electrically connected to the electrode assembly.

[0027] In a third aspect, the utility model discloses an electrical device, wherein the electrical device has the energy storage device as described in the second aspect above.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] The end cover assembly, energy storage device and electrical equipment provided by the embodiments of the utility model are provided with a first groove or a first protrusion on the side wall of the accommodating groove on the lower plastic, and a first protrusion or a first groove on the outer peripheral surface of the pressure ring, wherein the first protrusion is embedded in the first groove, so that the cooperation between the first protrusion and the first groove can be utilized to prevent the pole from twisting, increase the contact area between the pressure ring and the lower plastic, thereby improving the torsional resistance of the pole, so that the pole can have a better torsional resistance effect when subjected to torsional force, so as to avoid the pole from loosening or shaking, thereby improving the safety and reliability of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the end cover assembly disclosed in the embodiment of the utility model;

[0032] Figure 2 It is a three-dimensional structural schematic diagram of the end cover assembly disclosed in the embodiment of the utility model from another perspective;

[0033] Figure 3 It is a schematic diagram of the exploded structure of the end cover assembly disclosed in the embodiment of the utility model;

[0034] Figure 4 It is a schematic diagram of the exploded structure of the end cover assembly disclosed in the embodiment of the utility model from another perspective;

[0035] Figure 5a It is a three-dimensional structural schematic diagram of the lower plastic disclosed in the embodiment of the utility model;

[0036] Figure 5bThe lower plastic edge disclosed in the embodiment of the utility model Figure 5a Cross-sectional view in the MM direction;

[0037] Figure 6 It is a three-dimensional structural diagram of the lower plastic from another perspective disclosed in the embodiment of the utility model;

[0038] Figure 7 It is a three-dimensional structural schematic diagram of the end cover plate disclosed in the embodiment of the utility model;

[0039] Figure 8a It is a three-dimensional structural schematic diagram of the end cover plate disclosed in the embodiment of the utility model from another perspective;

[0040] Figure 8b yes Figure 8a A top view of the end cover plate in FIG.

[0041] Fig. 9 It is a schematic diagram of the three-dimensional structure of the upper plastic disclosed in the embodiment of the utility model;

[0042] Fig.10 It is a three-dimensional structural schematic diagram of the upper plastic disclosed in the embodiment of the utility model from another perspective;

[0043] Fig.11 It is a top view of the upper plastic disclosed in the embodiment of the utility model;

[0044] Fig.12a yes Fig.11 A cross-sectional view of the upper plastic along the AA direction;

[0045] Figure 12b It is a bottom view of the upper plastic disclosed in the embodiment of the utility model;

[0046] Fig.13a It is a schematic diagram of the structure of the pole disclosed in the embodiment of the utility model;

[0047] Fig.13b yes Fig.13a A top view of the pole in FIG.

[0048] Fig.14 It is a structural schematic diagram of the energy storage device disclosed in the embodiment of the utility model;

[0049] Fig.15 It is a structural schematic diagram of a household energy storage system in which the electrical equipment disclosed in the embodiment of the utility model is used;

[0050] Fig.16 It is a structural schematic diagram of an electric device disclosed in an embodiment of the utility model as an energy storage system.

[0051] Description of main reference numerals

[0052] 100-end cover assembly; 11-end cover plate; 111-first through hole; 112-second groove; 112a-first limiting surface; 113-third groove; 113a-first straight groove wall; 113b-first arc groove wall; 12-lower plastic; 121-second through hole; 122-accommodating groove; 122a-third limiting surface; 122b-first groove body portion; 122c-second groove body portion; 123-first groove; 124-second protrusion; 124a-second limiting surface; 13-pole Column; 13a-column body; 13b-disk body; 131-fourth protrusion; 131a-second straight line side; 131b-second arc-shaped side; 14-pressing ring; 141-first protrusion; 142-fourth limiting surface; 15-upper plastic; 151-third through hole; 152-third protrusion; 152a-first straight line side; 152b-first arc-shaped side; 153-fourth groove; 153a-second straight line groove wall; 153b-second arc-shaped groove wall; 154-receiving groove;

[0053] f1-first direction; f2-length direction; f3-width direction;

[0054] 200-energy storage device; 21-housing; 211-opening; 22-electrode assembly;

[0055] 300-household energy storage system; 200-energy storage device; 31-electric energy conversion device; 32-first user load; 33-second user load;

[0056] 400 - energy storage system; 410 - high voltage cable; 420 - first electric energy conversion device; 430 - second electric energy conversion device. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0059] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first protrusion may be referred to as a second protrusion, and similarly, a second protrusion may be referred to as a first protrusion. Both the first protrusion and the second protrusion are protrusions, but they are not the same protrusion.

[0060] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0061] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0062] When the pole is welded to the bus, the shaking of the bus will drive the pole to shake, which will affect the welding of the pole and the adapter. Therefore, in order to fix the pole and prevent it from shaking, the related technology usually uses a pressure ring, and sets the pressure ring on the outer periphery of the pole so that the pole can be pressed by the pressure ring to prevent the pole from shaking, so as to facilitate the subsequent welding of the pole and the adapter. Finally, the pole ear and the adapter are welded and fixed, thereby forming a circuit connection of the energy storage device. However, the contact area between the pressure ring and the lower plastic in the related technology is relatively small, resulting in a relatively low torsion resistance of the pole, which makes the pole easy to loosen when subjected to torque, thereby affecting the safety and reliability of the battery.

[0063] In view of this, an embodiment of the present application provides an end cover assembly that can improve the torque resistance of the pole. Specifically, the present application provides a first groove or a first protrusion on the side wall of the accommodating groove on the lower plastic, and provides a first protrusion or a first groove on the outer peripheral surface of the pressure ring, wherein the first protrusion is embedded in the first groove. In this way, the cooperation between the first protrusion and the first groove can be utilized to prevent the pole from twisting, increase the contact area between the pressure ring and the lower plastic, thereby improving the torsional resistance of the pole, so that the pole can have a better torsional resistance effect when subjected to torque, so as to avoid loosening and shaking of the pole, thereby improving the safety and reliability of the energy storage device.

[0064] The end cover assembly of the present application will be described in further detail below in conjunction with the accompanying drawings.

[0065] See also Figures 1 to 4 The embodiment of the first aspect of the utility model discloses an end cover assembly, which includes an end cover plate 11, a lower plastic 12, a pole 13 and a pressure ring 14. The end cover plate 11 is provided with a first through hole 111 penetrating along a first direction f1, the lower plastic 12 is stacked with the end cover plate 11, the lower plastic 12 is provided with a second through hole 121 penetrating along the first direction f1, and the surface of the lower plastic 12 facing the end cover plate 11 is provided with a receiving groove 122, the second through hole 121 penetrates the bottom surface of the receiving groove 122, the pole 13 is sequentially penetrated through the first through hole 111 and the second through hole 121, and the pressure ring 14 is sleeved on the outer periphery of the pole 13 and is located in the receiving groove 122. Among them, one of the side wall of the accommodating groove 122 and the outer peripheral surface of the pressure ring 14 is provided with a first groove 123, and the other of the side wall of the accommodating groove 122 and the outer peripheral surface of the pressure ring 14 is provided with a first protrusion 141, that is, when the side wall of the accommodating groove 122 is provided with the first groove 123, the outer peripheral surface of the pressure ring 14 is provided with the first protrusion 141, and when the side wall of the accommodating groove 122 is provided with the first protrusion 141, the outer peripheral surface of the pressure ring 14 is provided with the first groove 123, and the first protrusion 141 is embedded in the first groove 123.

[0066] By providing a first groove 123 in one of the side wall of the accommodating groove 122 and the outer peripheral surface of the pressing ring 14, and providing a first protrusion 141 in the other of the side wall of the accommodating groove 122 and the outer peripheral surface of the pressing ring 14, the area of ​​the side wall of the accommodating groove 122 and the outer peripheral surface of the pressing ring 14 can be increased. At the same time, since the first protrusion 141 is embedded in the first groove 123, the contact area between the pressing ring 14 and the lower plastic 12 is increased, and the pole 13 can be prevented from twisting, so that the torsion resistance of the pole 13 can be improved, so that the pole 13 can have a better torsion resistance effect when subjected to torsion, so as to avoid the loosening and shaking of the pole 13, thereby improving the safety and reliability of the energy storage device.

[0067] The end cover plate 11 in the present application can be a plain aluminum sheet, which can be a square cover plate (such as a rectangular cover plate or a square cover plate) or a circular cover plate. Of course, in other embodiments, the end cover plate 11 can also be a cover plate of other shapes, such as an elliptical cover plate.

[0068] For example, Figures 1 to 4 As shown, the end cover plate 11 in the present application may be a rectangular cover plate, and the end cover plate 11 has a thickness direction, a length direction f2 and a width direction f3, wherein the thickness direction is parallel to the first direction f1, as shown in FIG. Figures 1 to 4As shown, the thickness direction may be the z-axis direction in the rectangular coordinate system, the length direction f2 may be the x-axis direction in the rectangular coordinate system, and the width direction f3 may be the y-axis direction in the rectangular coordinate system. The end cover plate 11 is provided with two first through holes 111 arranged at intervals along the length direction f2, and two poles 13 are provided, namely, a positive pole 13 and a negative pole 13, and the positive pole 13 and the negative pole 13 are respectively penetrated in the first through holes 111 corresponding to each other.

[0069] Preferably, if Figure 2 and Figure 3 As shown, the present application adopts a method in which the side wall of the accommodating groove 122 is provided with a first groove 123, and the outer peripheral surface of the pressure ring 14 is provided with a first protrusion 141, so as to ensure that there is a relatively large contact area between the surface of the pressure ring 14 facing the lower plastic 12 and the bottom surface of the accommodating groove 122, so that when subjected to torque, the pole 13 can have a better anti-torsion effect.

[0070] For example, the shape of the first protrusion 141 may be circular, elliptical, square, triangular or trapezoidal. Of course, in other embodiments, the shape of the first protrusion 141 may also be other shapes, such as a pentagon. Figure 2 and Figure 3 As shown, the first protrusion 141 is circular in shape, which is convenient for processing and not easy to form sharp corners, thereby avoiding stress concentration due to the existence of sharp corners, which causes the first protrusion 141 to be easily worn, thereby helping to increase the service life of the first protrusion 141.

[0071] In some embodiments, the first groove 123 may be multiple, for example, two, three, four, five or more, and the multiple first grooves 123 are arranged along the circumference of the receiving groove 122 or along the circumference of the pressure ring 14 at intervals; correspondingly, the first protrusion 141 may be multiple, for example, two, three, four, five or more, and the multiple first protrusions 141 are arranged along the circumference of the pressure ring 14 or along the circumference of the receiving groove 122 at intervals, that is, when the multiple first grooves 123 are arranged on the side wall of the receiving groove 122 and the multiple first protrusions 141 are arranged on the outer peripheral surface of the pressure ring 14, the multiple first grooves The plurality of first grooves 123 are arranged at intervals along the circumference of the receiving groove 122, and the plurality of first protrusions 141 are arranged at intervals along the circumference of the pressure ring 14; and when the plurality of first grooves 123 are arranged on the outer circumferential surface of the pressure ring 14, and the plurality of first protrusions 141 are arranged on the side wall of the receiving groove 122, the plurality of first grooves 123 are arranged at intervals along the circumference of the pressure ring 14, and the plurality of first protrusions 141 are arranged at intervals along the circumference of the receiving groove 122; and the plurality of first protrusions 141 are respectively embedded in the plurality of first grooves 123, and the plurality of first protrusions 141 are respectively embedded in the first grooves 123 corresponding to each other. The plurality of first grooves 123 and the plurality of first protrusions 141 can further improve the anti-torsion ability of the pole 13, thereby further improving the use safety and reliability of the energy storage device.

[0072] In some embodiments, the accommodating groove 122 may be a polygonal groove, such as a rectangular groove, a square groove, a pentagonal groove or a hexagonal groove, etc. Correspondingly, the pressing ring 14 may be a polygonal ring, such as a rectangular ring, a square ring, a pentagonal ring or a hexagonal ring, etc., one of the first groove 123 or the first protrusion 141 is located at the corner of the accommodating groove 122, and the other of the first groove 123 or the first protrusion 141 is located at the corner of the pressing ring 14, that is, when the first groove When the first protrusion 141 is arranged on the side wall of the receiving groove 122 and the first protrusion 141 is arranged on the outer peripheral surface of the pressing ring 14, the first groove 123 is located at the corner of the receiving groove 122, and the first protrusion 141 is located at the corner of the pressing ring 14; when the first protrusion 141 is arranged on the side wall of the receiving groove 122 and the first groove 123 is arranged on the outer peripheral surface of the pressing ring 14, the first protrusion 141 is located at the corner of the receiving groove 122, and the first groove 123 is located at the corner of the pressing ring 14. Preferably, as Figure 3 As shown, the accommodating groove 122 is a square groove, and first grooves 123 are formed at the three corners of the accommodating groove 122. Correspondingly, the pressing ring 14 is a square groove, and first protrusions 141 are formed at the three corners of the pressing ring 14. The three first protrusions 141 are respectively and one by one embedded in the corresponding first grooves 123.

[0073] The accommodating groove 122 in the present application adopts a polygonal groove, and the pressure ring 14 adopts a polygonal ring. Compared with the accommodating groove 122 adopting a circular groove, the pressure ring 14 adopts a circular ring, which can prevent the pressure ring 14 from twisting. Therefore, when the pole 13 is subjected to torsion, the pole 13 can have a better torsion resistance effect, thereby improving the safety and reliability of the energy storage device.

[0074] Although the polygonal accommodating groove 122 and the polygonal pressure ring 14 can limit the twisting of the pressure ring 14 to prevent the pole 13 from twisting, generally speaking, the positions where the two components are prone to torque and easy to fall off are usually at the corners. If there is a starting point for falling off, it should usually be at the corners. Therefore, the present application provides a first protrusion 141 at the corners where the pressure ring 14 is subjected to greater torque, so as to cooperate with the first groove 123 at the corners of the accommodating groove 122, so as to better prevent the risk of the pressure ring 14 and the lower plastic 12 falling off after being subjected to torque, so as to ensure the tightening effect of the pressure ring 14 on the pole 13 and prevent the pole 13 from twisting.

[0075] Moreover, if Figure 2 and Figure 3 As shown, in the length direction f2 of the end cover plate 11, the distance between the side surface of the end cover plate 11 in the length direction f2 and the side wall of the accommodating groove 122 in the length direction f2 is usually limited and small. If the first groove 123 is provided on the side wall of the accommodating groove 122 in the length direction f2, the depth of the first groove 123 in the length direction f2 will be relatively small, resulting in the first protrusion 141 not being embedded in the lower plastic 12 to a sufficient depth, which may cause the pole 13 to still be loose or shaken when subjected to torsion. Therefore, the first groove 123 is provided at the corner of the accommodating groove 122 to form a relatively large first groove 123, thereby deepening the depth of the first protrusion 141 embedded in the lower plastic 12, thereby greatly improving the torsion resistance of the pole 13.

[0076] In some embodiments, Figure 3 and Figure 4As shown, the surface of the end cover plate 11 facing the lower plastic 12 is provided with a second groove 112, and the surface of the end cover plate 11 facing the lower plastic 12 is convexly provided with a second protrusion 124, and the second protrusion 124 is embedded in the second groove 112; in this way, when the lower plastic 12 and the end cover plate 11 are assembled, the second groove 112 and the second protrusion 124 can be used to cooperate and embed to position the lower plastic 12 circumferentially and axially, and the assembly between the end cover plate 11 and the lower plastic 12 has a rapid positioning effect, which is beneficial to improve the assembly efficiency of the end cover assembly 100; at the same time, the first through hole 111 and the second through hole 121 can be correspondingly arranged, so that the pole 13 can be sequentially penetrated into the second through hole 121 and the first through hole 111, thereby facilitating the assembly of the end cover assembly 100.

[0077] Furthermore, if Figure 5a , Figure 5b and Figure 6 As shown, the second protrusion 124 is arranged corresponding to the accommodating groove 122, and the second protrusion 124 is provided with the aforementioned first through hole 111, and the accommodating groove 122 includes a first groove body portion 122b and a second groove body portion 122c which are connected to each other, wherein the first groove body portion 122b is formed on the lower plastic 12, and the second groove body portion 122c is located at the second groove body portion 122c formed on the second protrusion 124, that is, the accommodating groove 122 extends from the lower plastic 12 to the second protrusion 124.

[0078] A second protrusion 124 corresponding to the accommodating groove 122 is provided on the surface of the lower plastic 12 facing away from the end cover plate 11, so that the second protrusion 124 can provide a forming position for the accommodating groove 122, so that a part of the accommodating groove 122 can be formed on the second protrusion 124, that is, the accommodating groove 122 can extend from the lower plastic 12 to the second protrusion 124, so that the depth of the accommodating groove 122 can be deepened without thickening the entire lower plastic 12, so as to ensure that the accommodating groove 122 has enough depth to accommodate a thicker pressing ring 14, so that the contact area between the outer peripheral surface of the pressing ring 14 and the side wall of the accommodating groove 122 can be increased, so as to further increase the contact area between the pressing ring 14 and the lower plastic 12, thereby further improving the torsion resistance of the pole 13, and further improving the safety and reliability of the energy storage device.

[0079] In addition, as can be seen from the above, through the provision of the second protrusion 124, the present application does not need to thicken the entire lower plastic 12, but can only thicken it partially to achieve a deepening of the depth of the first groove 123. This can make the weight of the lower plastic 12 relatively light, which is beneficial to the lightweight design of the end cover assembly 100.

[0080] It is understandable that although the depth of the accommodating groove 122 is deepened, it does not necessarily mean that the depth of the first groove 123 arranged on the side wall of the accommodating groove 122 is also deepened, or it does not necessarily mean that the thickness of the first protrusion 141 arranged on the side wall of the accommodating groove 122 is thickened. Therefore, in some embodiments, in the first direction f1, the size of the first groove 123 or the first protrusion 141 is substantially equal to the size of the accommodating groove 122, so as to ensure that there is a relatively large contact area between the first groove 123 and the first protrusion 141, so as to ensure that the pole 13 has better torsional resistance.

[0081] Exemplarily, the second groove 112 may be a polygonal groove, such as a rectangular groove, a square groove, a pentagonal groove or a hexagonal groove, etc., and correspondingly, the second protrusion 124 may be a polygonal protrusion, such as a rectangular protrusion, a square protrusion, a pentagonal protrusion or a hexagonal protrusion, etc. Preferably, as Figure 3 and Figure 4 As shown, the second groove 112 is a square groove, and the second protrusion 124 is a square protrusion. The accommodating groove 122 in the present application adopts a polygonal groove, and the second protrusion 124 adopts a polygonal protrusion. Compared with the second groove 112 adopting a circular groove, the second protrusion 124 adopts a circular protrusion, which can prevent the end cover plate 11 and the lower plastic 12 from twisting, so that when the pole 13 is subjected to torsion, the pole 13 can have a better torsion resistance effect, thereby improving the safety and reliability of the energy storage device.

[0082] In addition to preventing the end cover plate 11 and the lower plastic 12 from twisting by limiting the shapes of the second groove 112 and the second protrusion 124, the present application can also provide a first limiting surface 112a on the side wall of the second groove 112 and a second limiting surface 124a on the outer peripheral surface of the second protrusion 124, so that the second limiting surface 124a and the first limiting surface 112a can be used to cooperate with each other to limit the twisting between the lower plastic 12 and the end cover plate 11, thereby limiting the rotational freedom of the lower plastic 12, thereby preventing the lower plastic 12 from rotating relative to the pole 13, and further improving the structural stability of the end cover assembly 100; at the same time, the second limiting surface 124a and the first limiting surface 112a can cooperate with each other to ensure that the lower plastic 12 and the end cover plate 11 can only be installed in a specific direction, which has a fool-proof effect on the installation between the lower plastic 12 and the end cover plate 11 and avoids reverse installation.

[0083] In some embodiments, in combination Figures 5a to 7As shown, on the basis of designing the shapes of the second groove 112 and the second protrusion 124 as polygons, a first limiting surface 112a can be provided on the side wall of the second groove 112, and a second limiting surface 124a can be provided on the outer peripheral surface of the second protrusion 124. Specifically, the first limiting surface 112a can be formed at the corners of the second groove 112, and the second limiting surface 124a can be formed at the corners of the second protrusion 124. In this way, a double limiting effect can be achieved, and the limiting effect is better, which can better prevent the lower plastic 12 from rotating relative to the end cover plate 11, thereby making the structure of the end cover assembly 100 more stable.

[0084] In some embodiments, in combination Figures 4 to 7 As shown, a third limiting surface 122a is provided at a position corresponding to the second limiting surface 124a of the accommodating groove 122, and the third limiting surface 122a is arranged in parallel with the second limiting surface 124a; and a fourth limiting surface 142 is also provided on the outer peripheral surface of the pressing ring 14, and the fourth limiting surface 142 and the third limiting surface 122a are fitted together. In this way, on the one hand, the rotational freedom of the pressing ring 14 can be further limited by the cooperation of the fourth limiting surface 142 and the third limiting surface 122a fitting together, so as to better prevent the pole 13 from twisting and improve the torsion resistance of the pole 13; on the other hand, by providing a third limiting surface 122a parallel to the second limiting surface 124a at a position corresponding to the second limiting surface 124a of the accommodating groove 122, it can ensure that the thickness of the lower plastic 12 at any position can be kept uniform, so as to avoid the deformation of the lower plastic 12 due to uneven thickness in the flow channel during the injection molding process, thereby facilitating the molding of the lower plastic 12.

[0085] In some embodiments, in combination Figure 4 , Figures 8a to 13aAs shown, the end cover assembly 100 also includes an upper plastic 15, which is stacked on a side of the end cover plate 11 facing away from the lower plastic 12, and the upper plastic 15 is provided with a third through hole 151 penetrating along the first direction f1, and the pole 13 is sequentially penetrated through the third through hole 151, the first through hole 111 and the second through hole 121; wherein, one of the end cover plate 11 and the upper plastic 15 is provided with a third groove 113, and the other of the end cover plate 11 and the upper plastic 15 is provided with a third protrusion 152, and the third protrusion 152 is embedded in the third groove 113, and / or, one of the upper plastic 15 and the pole 13 is provided with a fourth groove 153, and the other of the upper plastic 15 and the pole 13 is provided with a fourth protrusion 131, and the fourth protrusion 131 is embedded in the fourth groove 153. Preferably, one of the end cover plate 11 and the upper plastic 15 is provided with a third groove 113, and the other of the end cover plate 11 and the upper plastic 15 is provided with a third protrusion 152 embedded in the third groove 113, and one of the upper plastic 15 and the pole 13 is provided with a fourth groove 153, and the other of the upper plastic 15 and the pole 13 is provided with a fourth protrusion 131 embedded in the fourth groove 153.

[0086] In this way, the upper plastic 15 can be constrained with the pole 13 and the end cover plate 11, and the rotational freedom of the pole 13 can be constrained multiple times, so as to better prevent the pole 13 from twisting, so that the pole 13 can have a better anti-twist effect when subjected to torsion. Specifically, through the arrangement of the third groove 113, the third protrusion 152, the fourth groove 153 and the fourth protrusion 131, the rotational freedom of the upper plastic 15 can be limited by the matching constraint between the third protrusion 152 and the third groove 113, so as to limit the twisting between the upper plastic 15 and the end cover plate 11; and the rotational freedom of the pole 13 can be limited by the matching constraint between the fourth protrusion 131 and the fourth groove 153, so as to limit the twisting between the upper plastic 15 and the pole 13, so that the anti-twist ability of the pole 13 can be greatly improved, and the reliability of the end cover assembly 100 can be enhanced.

[0087] Exemplarily, the end cover plate 11 is provided with a plurality of third grooves 113, such as two, three, four, five or more, and the plurality of third grooves 113 are circumferentially distributed around the periphery of the first through hole 111; the upper plastic 15 is provided with a plurality of third protrusions 152, such as two, three, four, five or more, and the plurality of third protrusions 152 are circumferentially distributed around the periphery of the third through hole 151, and the plurality of third protrusions 152 are respectively embedded in the plurality of third grooves 113; and the upper plastic 15 is also provided with a plurality of fourth grooves 153, and the plurality of fourth grooves 153 are circumferentially distributed around the periphery of the third through hole 151; the pole 13 is provided with a plurality of fourth protrusions 131, and the plurality of fourth protrusions 131 are circumferentially distributed around the periphery of the pole 13, and the plurality of fourth protrusions 131 are respectively embedded in the plurality of fourth grooves 153. By providing a plurality of third grooves 113, a plurality of third protrusions 152, a plurality of fourth grooves 153 and a plurality of fourth protrusions 131, the upper plastic 15 and the pole 13 have a better anti-torsion effect.

[0088] In some embodiments, in combination Figures 9 to 12a As shown, when the upper plastic 15 is provided with a third protrusion 152 and a fourth groove 153, the third protrusion 152 corresponds to the fourth groove 153; or, when the upper plastic 15 is provided with a third groove 113 and a fourth protrusion 131, the third groove 113 corresponds to the fourth protrusion 131. That is, the upper plastic 15 is provided with both protrusions and grooves, and the protrusions and grooves provided on the upper plastic 15 are provided correspondingly, so that the thickness of the upper plastic 15 at any position can be kept uniform, so as to avoid deformation of the upper plastic 15 due to uneven thickness in the flow channel during the injection molding process, thereby facilitating the molding of the upper plastic 15.

[0089] In some embodiments, Figure 8a , Figure 8b , Fig.10 and Figure 12b As shown, the third groove 113 includes two first straight groove walls 113a and a first arcuate groove wall 113b connected between the two first straight groove walls 113a, the straight direction of the first straight groove wall 113a and the axial direction perpendicular to the first arcuate groove wall 113b have a first angle α1, the peripheral side surface of the third protrusion 152 includes two first straight side surfaces 152a and a first arcuate side surface 152b connected between the two first straight side surfaces 152a, the straight direction of the first straight side surface 152a and the axial direction perpendicular to the first arcuate side surface 152b have a second angle α2, the first straight side surface 152a is in contact with the first straight groove wall 113a, and the first arcuate side surface 152b is in contact with the first arcuate groove wall 113b, so that the shapes of the third groove 113 and the third protrusion 152 are both fan-shaped.

[0090] Similarly, if Fig. 9 , Fig.11 , Fig.13a and Fig.13b As shown, the fourth groove 153 includes two second straight groove walls 153a and a second arc-shaped groove wall 153b connected between the two second straight groove walls 153a, the straight direction of the second straight groove wall 153a and the axial direction perpendicular to the second arc-shaped groove wall 153b have a third angle α3, the peripheral side surface of the fourth protrusion 131 includes two second straight side surfaces 131a and a second arc-shaped side surface 131b connected between the two second straight side surfaces 131a, the straight direction of the second straight side surface 131a and the axial direction perpendicular to the second arc-shaped side surface 131b have a fourth angle α4, the second straight side surface 131a is in contact with the second straight groove wall 153a, and the second arc-shaped side surface 131b is in contact with the second arc-shaped groove wall 153b, so that the shapes of the fourth groove 153 and the fourth protrusion 131 are both fan-shaped.

[0091] In the cooperation between the third groove 113 and the third protrusion 152, and in the cooperation between the fourth groove 153 and the fourth protrusion 131, all are surface contact. The fan-shaped third groove 113, the third protrusion 152, the fourth groove 153 and the fourth protrusion 131 are more helpful to increase the contact area between the third groove 113 and the third protrusion 152, and increase the contact area between the fourth groove 153 and the fourth protrusion 131, compared with the square shape of the third groove 113, the third protrusion 152, the fourth groove 153 and the fourth protrusion 131, so as to avoid uneven force.

[0092] In some embodiments, in combination Figure 4 , Fig.12a , Fig.13a and Fig.13b As shown, the surface of the upper plastic 15 facing away from the end cover plate 11 is provided with a receiving groove 154, and the third through hole 151 passes through the bottom surface of the receiving groove 154; the pole 13 includes a column portion 13a and a disk portion 13b, the column portion 13a is sequentially penetrated by the third through hole 151, the first through hole 111 and the second through hole 121, the pressing ring 14 is sleeved on the outer periphery of the column portion 13a, the disk portion 13b is connected to the column portion 13a, and the disk portion 13b is at least partially located in the receiving groove 154; wherein, one of the bottom surface of the receiving groove 154 and the disk portion 13b is provided with a fourth groove 153, and the other of the bottom surface of the receiving groove 154 and the disk portion 13b is provided with a fourth protrusion 131. By providing a receiving groove 154 on the surface of the upper plastic 15 facing away from the end cover plate 11 to receive part or the entire disc body 13b, the overall structure of the end cover assembly 100 can be made more compact, thereby facilitating the miniaturization design of the end cover assembly 100.

[0093] See also Fig.14The embodiment of the second aspect of the utility model discloses an energy storage device, the energy storage device 200 comprises a shell 21, an electrode assembly 22 and the end cap assembly 100 as described above, the shell 21 has an opening 211, the electrode assembly 22 is built in the shell 21, the end cap plate 11 of the end cap assembly 100 is sealed and connected to the opening 211, the lower plastic 12 is arranged toward the electrode assembly 22, and the pole 13 is electrically connected to the electrode assembly 22. It can be understood that the energy storage device 200 having the end cap assembly 100 described above can bring the same or similar beneficial effects as the end cap assembly 100, and the specific description can be referred to the description of the embodiment of the end cap assembly 100, which will not be repeated here.

[0094] Optionally, the energy storage device 200 may include but is not limited to a single cell, a battery module, a battery pack, a battery system, etc. The actual application form of the energy storage device 200 provided in the embodiment of the present application may be but is not limited to the listed products, and may also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device 200. The embodiment of the present application only takes the energy storage device 200 as a multi-core battery as an example for explanation. When the energy storage device 200 is a single cell, the energy storage device 200 may be at least one of a cylindrical battery, a square battery, etc.

[0095] In some embodiments, the pressure ring can be welded to the electrode assembly 22, so that the pole 13 can be welded to the electrode assembly 22 directly and can also be welded to the electrode assembly 22 through the pressure ring, thereby reducing the risk of high temperature of the pole 13.

[0096] The embodiment of the third aspect of the present utility model discloses an electric device, which has an energy storage device as described above. It can be understood that the electric device with the energy storage device described above can also bring the same or similar beneficial effects as the end cover assembly because the energy storage device can bring the same or similar beneficial effects as the end cover assembly. For details, please refer to the description of the embodiment of the end cover assembly, which will not be repeated here.

[0097] The electrical equipment in this embodiment can be but is not limited to household energy storage systems, energy storage systems, battery vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0098] An exemplary example is Fig.15 As shown, Fig.15 The electrical equipment provided in one embodiment of the present application is used as a schematic diagram of the structure of a household energy storage system, and the electrical equipment provided in the present application is used as a schematic diagram of the structure of a household energy storage system Fig.15 The illustrated embodiment is described by taking the household energy storage scenario in the user-side energy storage as an example. Fig.15 It only shows an application scenario of the electrical equipment in this application as a household energy storage system. The application scenario of the electrical equipment in this application is not limited to the household energy storage scenario.

[0099] like Fig.15 As shown, when the electrical equipment is a household energy storage system 300, the household energy storage system 300 may include an energy storage device 200, an electric energy conversion device 31 (photovoltaic panel), a first user load 32 (street lamp) and a second user load 33 (such as household appliances such as air conditioners). Among them, the energy storage device 200 is a small energy storage box, which can be mounted on an outdoor wall by wall hanging. Specifically, photovoltaic panels can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 200 is used to store the electrical energy and supply it to street lamps and household appliances for use during peak electricity prices, or to supply power when the power grid is out of power / power outage.

[0100] Another exemplary example is Fig.16 As shown, Fig.16 The electrical equipment provided in one embodiment of the present application is used as a structural diagram of an energy storage system, and the present application Fig.16 The embodiment is described by taking the shared energy storage scenario on the generation / distribution side as an example. Fig.16 It only shows an application scenario of the electrical equipment in this application as a household energy storage system. The application scenario of the electrical equipment in this application is not limited to its generation / distribution side energy storage scenario.

[0101] like Fig.16As shown, when the electrical equipment is an energy storage system 400, the energy storage system 400 includes a high-voltage cable 410, a first electric energy conversion device 420, a second electric energy conversion device 430 and an energy storage device 200 provided in the aforementioned embodiment of the present application. In the case of power generation, the first electric energy conversion device 420 and the second electric energy conversion device 430 are used to convert other forms of energy into electric energy, connected to the high-voltage cable 410 and supplied to the power distribution network for use. When the power load is low and the first electric energy conversion device 420 and the second electric energy conversion device 430 generate excess power, the excess power is stored in the energy storage device 200, reducing the wind and light abandonment rates and improving the problem of new energy power generation and consumption. When the power load is high, the power grid issues an instruction to use the power stored in the energy storage device 200 in conjunction with the high-voltage cable 410 to transmit the power to the power consumption side in a grid-connected mode, providing peak shaving, frequency regulation, standby and other services for the operation of the power grid, giving full play to the peak shaving role of the power grid, promoting the peak shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0102] Optionally, the first electric energy conversion device 420 and the second electric energy conversion device 430 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0103] In the present application, the number of energy storage devices 200 can be multiple, and multiple energy storage devices 200 are connected in series or in parallel. Multiple energy storage devices 200 are supported and electrically connected by isolation plates (not shown). In this embodiment, "multiple" refers to two or more. An energy storage box can also be provided outside the energy storage device 200 to accommodate the energy storage device 200.

[0104] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] In addition, the above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the content of this specification should not be understood as limiting the present application, and the protection scope of the present application shall be subject to the attached claims.

Claims

1. An end cap assembly, characterized in that: The end cap assembly comprises: An end cover plate (11), wherein the end cover plate (11) is provided with a first through hole (111) penetrating along a first direction (f1); A lower plastic (12), the lower plastic (12) and the end cover plate (11) are stacked, the lower plastic (12) is provided with a second through hole (121) penetrating along the first direction (f1), and a surface of the lower plastic (12) facing the end cover plate (11) is provided with a receiving groove (122), and the second through hole (121) penetrates the bottom surface of the receiving groove (122); A pole (13), the pole (13) being sequentially inserted into the first through hole (111) and the second through hole (121); and A pressure ring (14), the pressure ring (14) being sleeved on the outer circumference of the pole (13) and located in the accommodating groove (122); One of the side wall of the accommodating groove (122) and the outer peripheral surface of the pressure ring (14) is provided with a first groove (123), and the other of the side wall of the accommodating groove (122) and the outer peripheral surface of the pressure ring (14) is provided with a first protrusion (141), and the first protrusion (141) is embedded in the first groove (123).

2. The end cap assembly according to claim 1, characterized in that: The accommodating groove (122) is a polygonal groove, the pressing ring (14) is a polygonal ring, one of the first groove (123) or the first protrusion (141) is located at a corner of the accommodating groove (122), and the other of the first groove (123) or the first protrusion (141) is located at a corner of the pressing ring (14).

3. The end cap assembly according to claim 1, characterized in that: A second groove (112) is provided on the surface of the end cover plate (11) facing the lower plastic (12), and a second protrusion (124) is provided on the surface of the lower plastic (12) facing the end cover plate (11), and the second protrusion (124) is embedded in the second groove (112); The second protrusion (124) is arranged corresponding to the receiving groove (122), and the second protrusion (124) is provided with the first through hole (111); the receiving groove (122) comprises a first groove body portion (122b) and a second groove body portion (122c) connected to the first groove body portion (122b); the first groove body portion (122b) is formed on the lower plastic (12), and the second groove body portion (122c) is formed on the second protrusion (124).

4. The end cap assembly according to claim 3, characterized in that: The side wall of the second groove (112) is provided with a first limiting surface (112a), the outer peripheral surface of the second protrusion (124) is provided with a second limiting surface (124a), and the second limiting surface (124a) and the first limiting surface (112a) are in contact with each other.

5. The end cap assembly according to claim 4, characterized in that: The accommodating groove (122) is provided with a third limiting surface (122a) at a position corresponding to the second limiting surface (124a), and the third limiting surface (122a) is arranged parallel to the second limiting surface (124a); The outer peripheral surface of the pressure ring (14) is also provided with a fourth limiting surface (142), and the fourth limiting surface (142) and the third limiting surface (122a) are in contact with each other.

6. The end cap assembly according to claim 1, characterized in that: There are a plurality of the first grooves (123), and the plurality of the first grooves (123) are arranged at intervals along the circumference of the accommodating groove (122) or along the circumference of the pressure ring (14); There are a plurality of first protrusions (141), and the plurality of first protrusions (141) are arranged at intervals along the circumference of the pressure ring (14) or along the circumference of the accommodating groove (122), and the plurality of first protrusions (141) are respectively embedded in a plurality of first grooves (123).

7. The end cap assembly according to any one of claims 1 to 6, characterized in that: The end cover assembly (100) further comprises an upper plastic (15), the upper plastic (15) being stacked on a side of the end cover plate (11) facing away from the lower plastic (12), and the lower plastic (12) being provided with a third through hole (151) penetrating along the first direction (f1), and the pole (13) being sequentially penetrated through the third through hole (151), the first through hole (111) and the second through hole (121); Wherein, one of the end cover plate (11) and the upper plastic (15) is provided with a third groove (113), and the other of the end cover plate (11) and the upper plastic (15) is provided with a third protrusion (152), and the third protrusion (152) is embedded in the third groove (113); and / or, one of the upper plastic (15) and the pole (13) is provided with a fourth groove (153), and the other of the upper plastic (15) and the pole (13) is provided with a fourth protrusion (131), and the fourth protrusion (131) is embedded in the fourth groove (153).

8. The end cap assembly according to claim 7, characterized in that: When the upper plastic (15) is provided with the third protrusion (152) and the fourth groove (153), the third protrusion (152) corresponds to the fourth groove (153); or, When the upper plastic (15) is provided with the third groove (113) and the fourth protrusion (131), the third groove (113) corresponds to the fourth protrusion (131).

9. The end cap assembly according to claim 7, characterized in that: The third groove (113) includes two first straight groove walls and a first arc-shaped groove wall connected between the two first straight groove walls, the straight direction of the first straight groove wall and the axial direction perpendicular to the first arc-shaped groove wall have a first included angle, the peripheral side surface of the third protrusion (152) includes two first straight side surfaces and a first arc-shaped side surface connected between the two first straight side surfaces, the first straight side surface is in contact with the first straight groove wall, and the first arc-shaped side surface is in contact with the first arc-shaped groove wall; The fourth groove (153) includes two second straight groove walls and a second arc-shaped groove wall connected between the two second straight groove walls, the straight direction of the second straight groove wall and the axial direction perpendicular to the second arc-shaped groove wall have a third angle, the circumferential side surface of the fourth protrusion (131) includes two second straight side surfaces and a second arc-shaped side surface connected between the two second straight side surfaces, the second straight side surface is in contact with the first straight groove wall, and the second arc-shaped side surface is in contact with the second arc-shaped groove wall.

10. The end cap assembly according to claim 7, characterized in that: A receiving groove (154) is provided on the surface of the upper plastic (15) facing away from the end cover plate (11), and the third through hole (151) passes through the bottom surface of the receiving groove (154); The pole (13) comprises a column portion (13a) and a disk portion (13b), the column portion (13a) is sequentially inserted into the third through hole (151), the first through hole (111) and the second through hole (121), the pressure ring (14) is sleeved on the outer periphery of the column portion (13a), the disk portion (13b) is connected to the column portion (13a), and the disk portion (13b) is at least partially located in the receiving groove (154); The fourth groove (153) is provided on one of the bottom surface of the receiving groove (154) and the disc body (13b), and the fourth protrusion (131) is provided on the other of the bottom surface of the receiving groove (154) and the disc body (13b).

11. An energy storage device, characterized in that: The energy storage device (200) comprises a shell (21), an electrode assembly (22) and an end cover assembly (100) according to any one of claims 1 to 10, wherein the shell (21) has an opening (211), the electrode assembly (22) is built into the shell (21), the end cover plate (11) is sealed and connected to the opening (211), the lower plastic (12) is arranged toward the electrode assembly (22), and the pole (13) is electrically connected to the electrode assembly (22).

12. An electrical device, characterized in that: The electrical consumer (300) has the energy storage device (200) as claimed in claim 11.

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